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Planning, Assessment and Specification

Development of the Safety PlanSafety planning starts by considering functions in several or all of the phases of the safety lifecycle and by having a company Functional Safety Plan in accordance with IEC 61508.

The safety plan describes the organisational procedure of a project including safety-related functions throughout the entire plant lifecycle. It contains verification and validation plans and a review timetable. SELLA CONTROLS can assist with the design and implementation of this.

SIL AssessmentSELLA CONTROLS will assist you in determining the required safety-instrumented functions (SIFs). Appropriate layers of protection will be identified to determine which safety integrity level (SIL) belongs to each SIF.

This involves tools such as risk charts, a risk matrix and layers-of-protection analyses, to assist you with the following processes:

Drawing up a SIL assessment plan (including choice of method)

Assessments

Training

Analysing and documenting results

Specification and ProceduresThe End User is responsible for producing a safety system requirements specification (SSRS) with detailed descriptions. The SSRS together with operation and maintenance procedures, will contribute to risk reduction objectives being achieved and identify the proof testing intervals required.